Prosecutors believe Lamb, 30, can provide information for this case specifically, but they stopped short of detailing exactly what information they hope Lamb can provide.

Assistant State's Attorney Patrick Kenneally also wouldn't discuss the terms of the offer tendered to Lamb.

Lamb is charged with multiple felonies for allegedly breaking into his former friend's condo in April. He is believed to have removed an 800-pound safe containing 12 guns and other valuables belonging to John Farenzena.

The guns have never been recovered.

Farenzena has said he doesn't believe Lamb acted alone and even offered a $5,000 reward for anyone with information leading to the guns or additional arrests.

Lamb is most notably known as the five-time convicted felon who provided the state with testimony that led to a murder conviction in a decade-old murder case.

Taking the stand in the 2013 trial, Lamb testified that he punched 17-year-old Brian Carrick. The blow likely killed Carrick, though his body never has been found. Prosecutors at the time argued that a third man, Mario Casciaro, was responsible for Lamb's actions because Casciaro sent Lamb to collect on a drug debt from Carrick.

Casciaro is serving a 26-year sentence for the murder. His case is pending an appeal.

For his testimony in that case, prosecutors offered Lamb immunity from murder charges and a reduced prison sentence on a drug charge.

Carrick's father, Bill Carrick, along with Farenzena, have attended each of Lamb's court appearances.

The most serious charge against Lamb carries a possible prison term of up to 30 years. He remains in custody of the McHenry County Jail in lieu of $300,000 bond. His next court date is Aug. 19.